Spring.



a. E. CUTLER.

SPRING. APPLICATION FILED NOV. 7,1914. RENEWED AUG. 23, 1916.

. Patented Mar.6,1917. 1

rrnn srarne rare osrinnf GEORGE E. CUTLER, 0E MOUNT VERNON, NEW YORK.

SPRING.

Application filed November 7, 1914, Serial No. 870,845.

To all whom it may concern:

Be it known that I, GEORGE E. CUTLER, a citizen of the United States, residing at Mount Vernon, in the county of Westchester and State of New York, have invented certain new and useful Improvements in Springs, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain improvements in springs, and an object of the invention is to provide novel and improved means whereby the tension of the spring may be lncreased 1n accordance with the increase of the load supported by the spring whereby a maximum of efficiency may be tained.

l urthermore, it is an object of the invention to provide a spring. normally at its minimum of tension and having coacting therewith novel and improved means whereby the tension of the spring may be increased with convenience and facility in accordance with the requirements of practice.

The invention consists in the details of construetion and in the combination and arrangement of the several parts of my improved spring whereby certain important advantages are attained and the device is rendered simpler, less expensive and otherwise more convenient and advantageous for use,

all as will be hereinafter more fully set,

fortl The novel features of the invention will be'carefully defined in the appended claims.

In order that my invention may be the better understood, I will now proceed to .de-

scribe the same with reference to the accom-j panying drawings, wherein I Flgure 1 1s a fragmentary elevatloi'ial view illustrating somewhat diagrammatically'an embodiment of my invention em-- As disclosed in the accompanying draw-' ings, 1 denotes a front axle of a vehicle and 2 a load receiving body. Interposed between Specification of Letters Patent.

shaft 4.

with the under Patented Mar. 6, 1917. Renewed 'Au use'es, 191 c. Serial No. 116,533.

the axle 1 and the body 2 in a conventional manner is the semi-elliptical spring 3, the

opposite extremities lof which being disposed in substantial parallelism with theaxle l. 1 i r v Suitably supported by the axle 1 is the having its opposite extremities 5 reversely threaded,- the threads of such extremities-being disposed on the same pitch.

The threaded extremities- 5 are disposed through and operatively engaged with'the blocks or fulcrums 6 adapted to slide'upon the axle 1' and having their upper surfaces 7 crowned and adapted for engagement surface of the portions at of the spring 3. It will be readily perceived thatupon axialrotation of the shaft 4., the blocks or fulcrums 6 will be caused to move in unison but'in reverse directions. lVhile anyv means may be employed which will operate withfa cility and convenience fori nparting the requisite axial rotation to the shaft 1, 1 herein disclosea' vertically. disposed shaft 8 o-peratively engaged with the shaft 4 through the medium of the conventional beveled gears 9 while the intermediate portionof the shaft ,8 is provided with an operating means 10, herein disclosed as a conventional hand whee T.he spring 3 is normally of a tension to properly compensate for or resist the 1mmmum .of load afforded by the load receiving body 2 and the blocks or fulcrums 6 are normally adjusted out of Contact with the extremities of the spring 3. It will be selfevident that as the load carried, by the load receiving body 2 increases, it is only neces-v sary to'impart such axial rotation to the shaft 1 as to cause the blocks or fulcrums 6 to more outwardly to properly increase the tension of the spring 3 and in order that the tension of the spring may be readily determined, 1 find. it of advantage to employ an indicator 11 of conventional construction and herein disclosed as operatively engaged with the shaft 8. i

The form of invention disclosed in Fig.

2 is substantially identical with that set forth in Fig. 1, except that thespring 3 is of a three-quarterelliptical type having the outer extremities 12 thereof disposed in parallelism, while lower section of the spring is disposed in substantial parallelism with the frame 1 Interposed between the extremities l2 and the extremity 14 and the adjacent portion the inner extremity 1 1. of the of the frame 1 are the sliding blocks or fulcrums 6" adapted to operate in a manner as has been setforth relative to the blocks or fulcrums 6. These blocks or fulcrums 6 are herein disclosed as operatively engaged with the reversely threaded portions 5 of the shaft at which is adapted to be rotated in any desired manner. As disclosed in Fig. 3, the spring 3? is also of a three-quarter elliptical type but has the outer extremity of its upper section disposed on a depending scroll 15, and coacting with the inner portion of such scroll 15 is the rocking or swinging fulcrum 16 pivotally supported, as at 17, at

upper and lower sections The rocking jor swinging fulcrum 1G is fixedly secured to the connecting pin or bolt 17, and it will be readily perceived that upon imparting the requisite rocking movement to the fulcrum 16, the tension of the spring 3* may be controlled in accordance with the necessities of practice. is provided with a, rock arm 18 adapted to be engaged by any suitable means for imparting the requisite movement thereto.

From the foregoing description, it is thought to be obvious that a spring constructed in accordance with my invention is of an extremely simple and comparatively inexpensive nature and is particularly well adapted for use by reason of the convenience and facility with which it may be assembled, and it will also be obvious that my invention the junction of the of the spring 0 Copies of this patent may be As herein disclosed, the pin orbolt 1'7 is susceptible of some change and modification without material spirit principles and departure from the thereof and for this and formation of the several parts herein shown in carrying out my invention in practice.

What I claim is:

l. The combinationwith a and a spring interposed receiving body, tliere'oetween; of in support, a load cans for adjusting the tension of the spring in accordance with the load carried by the l means under control for indicating the under the influence 0 oad receiving body, and of the adjusting means tension of the spring f the first named means.

2. The combination with a support, a load receiving body, and a therebetween and n mum of tension; of movable means coacting L with the spring for spring interposed ormally under a miniincreasing the tension thereof, mechanism for imparting movement to said means, and means under control of the operating mecha nism for indicating the tension of the spring under the influence of the movable means.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses.

lVitnesses ORGE E. CUTLER.

WV. E. Lawson,

E. L. WHITE.

Washington, D. G.

Commissioner of Patents, 

